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Spiral eigenmodes triggered by grooves in the phase space of disc galaxies

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Abstract
We use linear perturbation theory to investigate how a groove in the phase space of a disc galaxy changes the stellar disc's stability properties. Such a groove is a narrow trough around a fixed angular momentum from which most stars have been removed, rendering part of the disc unresponsive to spiral waves. We find that a groove can dramatically alter a disc's eigenmode spectrum by giving rise to a set of vigorously growing eigenmodes. These eigenmodes are particular to the grooved disc and are absent from the original ungrooved disc'smode spectrum. We discuss the properties and possible origin of the different families of new modes. By the very nature of our technique, we prove that a narrow phase-space groove can be a source of rapidly growing spiral patterns that are true eigenmodes of the grooved disc and that no non-linear processes need to be invoked to explain their presence in N-body simulations of disc galaxies. Our results lend support to the idea that spiral structure can be a recurrent phenomenon, in which one generation of spiral modes alters a disc galaxy's phase space in such a way that a following generation of modes is destabilized.
Keywords
SYSTEMS, DENSITY, WAVES, STARS, BAR, NORMAL-MODES, STELLAR DISKS, GALACTIC DISCS, SECULAR EVOLUTION, galaxies: spiral, galaxies: kinematics and dynamics, galaxies: evolution

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Citation

Please use this url to cite or link to this publication:

Chicago
De Rijcke, Sven, and Ilya Voulis. 2016. “Spiral Eigenmodes Triggered by Grooves in the Phase Space of Disc Galaxies.” Monthly Notices of the Royal Astronomical Society 456 (2): 2024–2040.
APA
De Rijcke, S., & Voulis, I. (2016). Spiral eigenmodes triggered by grooves in the phase space of disc galaxies. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 456(2), 2024–2040.
Vancouver
1.
De Rijcke S, Voulis I. Spiral eigenmodes triggered by grooves in the phase space of disc galaxies. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY. 2016;456(2):2024–40.
MLA
De Rijcke, Sven, and Ilya Voulis. “Spiral Eigenmodes Triggered by Grooves in the Phase Space of Disc Galaxies.” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 456.2 (2016): 2024–2040. Print.
@article{7280013,
  abstract     = {We use linear perturbation theory to investigate how a groove in the phase space of a disc galaxy changes the stellar disc's stability properties. Such a groove is a narrow trough around a fixed angular momentum from which most stars have been removed, rendering part of the disc unresponsive to spiral waves. We find that a groove can dramatically alter a disc's eigenmode spectrum by giving rise to a set of vigorously growing eigenmodes. These eigenmodes are particular to the grooved disc and are absent from the original ungrooved disc'smode spectrum. We discuss the properties and possible origin of the different families of new modes. By the very nature of our technique, we prove that a narrow phase-space groove can be a source of rapidly growing spiral patterns that are true eigenmodes of the grooved disc and that no non-linear processes need to be invoked to explain their presence in N-body simulations of disc galaxies. Our results lend support to the idea that spiral structure can be a recurrent phenomenon, in which one generation of spiral modes alters a disc galaxy's phase space in such a way that a following generation of modes is destabilized.},
  author       = {De Rijcke, Sven and Voulis, Ilya},
  issn         = {0035-8711},
  journal      = {MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY},
  language     = {eng},
  number       = {2},
  pages        = {2024--2040},
  title        = {Spiral eigenmodes triggered by grooves in the phase space of disc galaxies},
  url          = {http://dx.doi.org/10.1093/mnras/stv2764},
  volume       = {456},
  year         = {2016},
}

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